Compare with Core 400S filter replacement compatible with Core 400S and 400S-RF air purifiers. Designed to fit your air purifier model. Why choose this filter? Precision fit, high quality, low noise operation, and same advanced filtration technology at a lower cost. The Core 400S filter replacement offers a reliable and cost-effective solution for maintaining clean indoor air. How does the filter work? The replacement filter features an H13 True HEPA filter, activated carbon filter, and nylon pre-filter. It captures 99.97% of airborne particles as small as 0.3 microns, including dust, pollen, smoke, and pet dander. It also helps reduce odors, VOCs, and other household smells. For optimal performance, replace the Core 400S filter every 12 months, depending on usage frequency and air quality conditions. Installation is simple and tool-free. Color: White Material: Plastic Package Contents: 1 x Filter Note: The actual product color may vary slightly due to lighting and screen display differences. Measurement may vary by +/- 1-3 cm.